Air conditioner and its control method

Abstract

The invention provides an air conditioner and a control method for the air conditioner. The air conditioner comprises a refrigerant circulating system composed of an evaporator, a condenser and a compressor. The control method comprises the step of waiting to preset air conditioner work time after the air conditioner is started to enable the temperature of a refrigerant pipe of the evaporator to be stable, the step of controlling an expansion valve to preset refrigerant exhaust temperature changes of the compressor, the step of detecting the temperature change trend of the refrigerant pipe of the evaporator, and the step of adjusting the expansion valve to change the exhaust temperature according to the temperature change trend to enable the temperature of the refrigerant pipe of the evaporator to remain stable. The control method can be used for constantly correcting the exhaust temperature of the compressor by controlling the expansion valve, finally obtaining an appropriate target exhaust temperature. Under the appropriate target exhaust temperature, the air conditioner can both have a higher refrigerating / heating effect and also has a higher energy utilization rate.

Description

technical field [0001] The invention relates to the field of air conditioners, in particular to an air conditioner and a control method thereof. Background technique [0002] The current air conditioner first detects the outdoor temperature after starting up and working. The expansion valve of the evaporator controls its own opening degree according to the outdoor ambient temperature. Under different opening degrees, the frequency value of the compressor is also different. The compressor frequency corresponds to a compressor discharge temperature. By adjusting the opening of the electronic expansion valve, the compressor frequency can be changed, and then the compressor discharge temperature can be adjusted. [0003] When the current air conditioner is working, its compressor frequency and compressor discharge temperature are only set according to the outdoor temperature. When the outdoor temperature is constant, even if the indoor temperature or humidity is different, it ...

AI Technical Summary

Problems solved by technology

[0004] When the discharge temperature of the compressor is too low, the refrigerant in the evaporator will evaporate incompletely, and the energy utilization rate will be low; when the target discharge temperature is too high, the evaporator will overheat seriously, affecting the cooling / heating effect

Moreover, when the indoor humidity is high, if the opening of the expansion valve is not adjusted in time to control the exhaust temperature of the compressor, problems such as water blowing and condensation will easily occur.

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